Author(s): V. P. SURYAVANSHI, S. B. SURYAWANSHI AND 1K. T. JADHAV

Abstract: A field experiment was conducted during 2012 and 2013 at Oilseeds Research Station, Latur (M.S.) to study the effect of different pre (PE) and post-emergence (POE) herbicides on yield and economics of sunflower in vertisols. Though the highest head diameter (17.5 and 15.9 cm), seed yield per plant (35.23 and 25.08 g), 100 seed weight (5.69 and 5.53 g) and seed yield (1710 kg ha-1) were observed in weed free situation, but these parameters were found statistically at par with the application of Pendimethalin 38.7 CS @ 0.75 kg a.i. ha-1 (PE) + one hoeing at 30 DAS followed by hand weeding at 40 DAS and application of Pendimethalin 38.7 CS @ 1.0 kg a.i. ha-1 (PE) + Quizalofop Ethyl 5% EC @ 37.5 g a.i. ha-1 or Propaquizofop 10% EC @ 62 g a.i. ha-1 or Fenoxoprop Ethyl 9.3% w/w@ 37.5 g a.i. ha-1 at 20 DAS (POE). The highest Net Monetary Return (‘ 38262 ha-1) and BC ratio (2.89) were recorded with the application Pendimethalin 38.7 CS @ 1.0 kg a.i. ha-1 (PE) + Quizalofop Ethyl 5% EC @ 37.5 g a.i. ha-1 at 20 DAS (POE). Among different chemical weed control methods lowest dry weed weight (12 and 83 g/m2), Weed Index (2.1 and 0.8) and highest Weed Control Efficiency (90 and 87 %) and Crop Resistance Index (10.2) were observed with the application Pendimethalin 38.7 CS @ 1.0 kg a.i. ha-1 (PE) + Quizalofop Ethyl 5% EC @ 37.5 g a.i. ha-1 at 20 DAS (POE). The application of Quizalofop Ethyl 5% EC @ 37.5 g a.i. ha-1 + Chlorimuron Ethyl 25 % wp @ 9 g a.i. ha-1 at 20 DAS (POE) has shown phytotoxicity effect on sunflower crop resulting stunted and reduced growth. In 0-10 scale phytotoxicity of this treatment was rated as 2-3 (20-30%).

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